update license to BSD 3-clause

[twsearle]

Description

Update the license to BSD 3-clause to match that used by other public met office packages such as MetOffice/opsinputs/pull/167

Issue(s) addressed

Part of #60

Impact

None expected.

Checklist

• functions are documented briefly via Doxygen comments in the code
• I have run the unit tests
• I have run mo-bundle to check integration with the rest of JEDI and run the unit tests under all environments

[matthewrmshin]

Looks good.

One minor point. We have now a mixture of Crown Copyright and British Crown Copyright. Worth making them consistent?

(Our branding team will argue for Crown Copyright instead of British Crown Copyright. For international collaboration, however, British Crown Copyright is likely to be more diplomatic. The choice is yours. 😄)

[twsearle]

@matthewrmshin Thanks! I hadn't noticed that it was all a bit of a mismatch. Hopefully I have caught all of those and converted them over now. I have removed any attempts at monarchy erasure for the Dutch, Spanish etc 😄

[matthewrmshin]

Looks good. Testing in my environment to make sure it builds OK. Will approve when done.

[matthewrmshin]

Tested in my environment. Works as expected.